Organization of Living Things

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Which of the following organs is a part of the circulatory system?

Which of the following organs is a part of the respiratory system?

What is a group of cells that work together to perform a common function?

What is a group of tissues that work together to perform a common function?

What is the smallest form of life?

Which of the following organs is a part of the digestive system?

Which of the following organs is a part of the nervous system?

Which of the following lists shows the levels of organzation in order from simple to most complex?